Brihat Samhita
प्राची तत्क्षणं एव नक्तं अपरा सन्ध्या त्र्यहाद्वा फलं सप्ताहात्परिवेषरेणुपरिघाः कुर्वन्ति सद्यो न चेत् । तद्वत्सूर्यकरैन्द्रकार्मुकतडित्प्रत्यर्कमेघानिलास् तस्मिन्नेव दिने अष्टमे अथ विहगाः सप्ताहपाका मृगाः ॥ ३०-३१ ॥
Generally, effects assigned to indications connected with the morning twilight hours will come to pass at once, and those of the evening twilight hours, either in the night or within 3 or 7 days; but effects assigned to halos, to dust-storms and to Parigha, will either come to pass at once or take 3 or 7 days; those assigned to the solar rays, to the rainbow, lightning, to parhelion, to clouds and to winds will take effect that same day; those assigned to birds will take 8 days; and those assigned to animals, 7 days.
english translation
prAcI tatkSaNaM eva naktaM aparA sandhyA tryahAdvA phalaM saptAhAtpariveSareNuparighAH kurvanti sadyo na cet । tadvatsUryakaraindrakArmukataDitpratyarkameghAnilAs tasminneva dine aSTame atha vihagAH saptAhapAkA mRgAH ॥ 30-31 ॥
hk transliteration by Sanscript